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18 slatten
| Question | Answer |
|---|---|
| fractional focal spot sizes must be used for | magnification technique |
| larger focal spot size results in | smaller umbral shadows |
| for digital radiography, the final degree of sharpness ik the displayed image is limited not only by the focal spot size but also by | pixel size |
| for an ap foot positioned w the thickest part to the radiographers left, which of the following could contribute to mottle in the cr or dr image | anode heel effect |
| if the focal spot is very much larger than the anatomy or pathology of interest the image of the anatomy can be caused to | disappear |
| smaller focal spot size causes | less blur |
| due to their different points of origin within the focal spot, the gradient partial absorption of x-rays as a function of the total absorption within an anatomical structure is capable of defined | geometrical penumbra |
| typical range of anode bevel angles for general purposes diagnostic xray tube is | 15-17 degree |
| size of the effective or projected focal spot is it’s size as measured | from the viewpoint of the image receptor |
| w all factors unchanged, if the focal spot is decreased, magnification in image will | not change at all |
| w all factors unchanged, if the focal spot size is increased fhe overall exposure level at the ir will | not chnage at all |
| exactly doubling the focal spot size will cause the spread of penumbra to | double |
| focal spot is directly responsible for the production of geometrical penumbra in the image bc | x-rays can be emitted at various angles from different points within in |
| steeper (more vertical) anode bevel angles cause | more severe anode heel effect |
| damage to the surface of the anode focal track can directly affect the | sharpness of detail, spatial resolution |
| a radiograph is slightly sharper at the cathode end then anode end bc | line focus principle |
| anode bevel angle is used to reduce the projedyed focal spot size relative to the actual spot size, thereby improving sharpness of detail heat load on the anode disc | line focus principle |
| severity of the anode heel effect when using fractional focus spots in angiography equipment imposes a limit on the | length of receptor plates that can be practically used |
Created by:
novah